In general terms, cold sensitivity occurs due to various degrees of nerve exposure.
The main causes include: tooth decay, a leaky filling, defective older fillings or crowns, a tiny crack, clenched or ground down tooth (bruxism), root recession, plaque build-up, gum disease, receded gum, a recent dental procedure, tooth whitening products.
Overaggressive brushing is also one of the causes. Too harsh strokes wear away the tooth's enamel layer as well as the gum tissue. This will leave your teeth vulnerable to hot or cold drinks and foods.
The exact cause of cold sensitivity should be diagnosed by a dentist who will determine what appropriate treatment should be. In the meantime, use a toothbrush with soft bristles together with desensitizing toothpaste, and brush gently and carefully.
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